Other Non-Interest Income and Expense (Other Non-Interest Income and Expense) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Other Income and Expenses [Abstract]
Other	$ 35,656	$ 32,256	$ 34,531
Total other non-interest income	35,656	32,256	34,531
Advertising, promotions and public relations	28,858	28,998	26,232
Professional services	26,283	27,365	26,132
Travel/meals and entertainment	15,346	14,813	13,571
Check card expense	13,008	11,923	9,384
Other	82,066	84,557	76,758
Total other non-interest expense	$ 165,561	$ 167,656	$ 152,077